The Rubber Egg
			MATERIALS:   a raw egg (with shell)                              vinegar                               small jar with lid
		PROCEDURE:  1.  Fill the jar about half way                                   with the vinegar.                              2.  Carefully place the egg                                    in the jar and put the lid                                    on the jar.                               3.  Check the egg 24 hours                                     later.                                      What has happened??
				EXPLANATION:  The acid in the vinegar combined chemically with the calcium in the egg shell.  As the calcium was removed, the shell became soft and rubbery.
	Now try this: Instead of an egg, place some clean chicken bones in a jar of vinegar, and observe the bones after 48 hours.  Now tie the bones in a knot, allow them to dry, and impress your friends with bones that are tied in a knot!!